package com.ruoyi.common.utils.file;

import java.io.*;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang3.ArrayUtils;
import com.ruoyi.common.utils.StringUtils;
import org.apache.poi.openxml4j.opc.ZipPackage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 文件处理工具类
 * 
 * @author ruoyi
 */
public class FileUtils extends org.apache.commons.io.FileUtils
{
    public static String FILENAME_PATTERN = "[a-zA-Z0-9_\\-\\|\\.\\u4e00-\\u9fa5]+";


    private static final Logger logger = LoggerFactory.getLogger(FileUtils.class);

    /**
     * 输出指定文件的byte数组
     * 
     * @param filePath 文件路径
     * @param os 输出流
     * @return
     */
    public static void writeBytes(String filePath, OutputStream os) throws IOException
    {
        FileInputStream fis = null;
        try
        {
            File file = new File(filePath);
            if (!file.exists())
            {
                throw new FileNotFoundException(filePath);
            }
            fis = new FileInputStream(file);
            byte[] b = new byte[1024];
            int length;
            while ((length = fis.read(b)) > 0)
            {
                os.write(b, 0, length);
            }
        }
        catch (IOException e)
        {
            throw e;
        }
        finally
        {
            if (os != null)
            {
                try
                {
                    os.close();
                }
                catch (IOException e1)
                {
                    e1.printStackTrace();
                }
            }
            if (fis != null)
            {
                try
                {
                    fis.close();
                }
                catch (IOException e1)
                {
                    e1.printStackTrace();
                }
            }
        }
    }

    /**
     * 删除文件
     * 
     * @param filePath 文件
     * @return
     */
    public static boolean deleteFile(String filePath)
    {
        boolean flag = false;
        File file = new File(filePath);
        // 路径为文件且不为空则进行删除
        if (file.isFile() && file.exists()) {
            file.delete();
            flag = true;
        }
        return flag;
    }

    /**
     * 删除目录下所有文件
     * @param filePath
     * @return
     */
    public static void deleteDir(File file) {
        // 路径为文件且不为空则进行删除
        if (file.isDirectory() && file.exists()) {
            File[] files = file.listFiles();
            for(File f:files){
                logger.info("删除文件："+f.getName());
                if(f.isDirectory()){
                    deleteDir(f);
                }else{
                    f.delete();
                }
            }
        }else{
            return;
        }
    }

    /**
     * 文件名称验证
     * 
     * @param filename 文件名称
     * @return true 正常 false 非法
     */
    public static boolean isValidFilename(String filename)
    {
        return filename.matches(FILENAME_PATTERN);
    }

    /**
     * 检查文件是否可下载
     * 
     * @param resource 需要下载的文件
     * @return true 正常 false 非法
     */
    public static boolean checkAllowDownload(String resource)
    {
        // 禁止目录上跳级别
        if (StringUtils.contains(resource, ".."))
        {
            return false;
        }

        // 检查允许下载的文件规则
        if (ArrayUtils.contains(MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION, FileTypeUtils.getFileType(resource)))
        {
            return true;
        }

        // 不在允许下载的文件规则
        return false;
    }

    /**
     * 下载文件名重新编码
     * 
     * @param request 请求对象
     * @param fileName 文件名
     * @return 编码后的文件名
     */
    public static String setFileDownloadHeader(HttpServletRequest request, String fileName) throws UnsupportedEncodingException
    {
        final String agent = request.getHeader("USER-AGENT");
        String filename = fileName;
        if (agent.contains("MSIE"))
        {
            // IE浏览器
            filename = URLEncoder.encode(filename, "utf-8");
            filename = filename.replace("+", " ");
        }
        else if (agent.contains("Firefox"))
        {
            // 火狐浏览器
            filename = new String(fileName.getBytes(), "ISO8859-1");
        }
        else if (agent.contains("Chrome"))
        {
            // google浏览器
            filename = URLEncoder.encode(filename, "utf-8");
        }
        else
        {
            // 其它浏览器
            filename = URLEncoder.encode(filename, "utf-8");
        }
        return filename;
    }

    /**
     * 下载文件名重新编码
     *
     * @param response 响应对象
     * @param realFileName 真实文件名
     * @return
     */
    public static void setAttachmentResponseHeader(HttpServletResponse response, String realFileName) throws UnsupportedEncodingException
    {
        String percentEncodedFileName = percentEncode(realFileName);

        StringBuilder contentDispositionValue = new StringBuilder();
        contentDispositionValue.append("attachment; filename=")
                .append(percentEncodedFileName)
                .append(";")
                .append("filename*=")
                .append("utf-8''")
                .append(percentEncodedFileName);

        response.setHeader("Content-disposition", contentDispositionValue.toString());
    }

    /**
     * 百分号编码工具方法
     *
     * @param s 需要百分号编码的字符串
     * @return 百分号编码后的字符串
     */
    public static String percentEncode(String s) throws UnsupportedEncodingException
    {
        String encode = URLEncoder.encode(s, StandardCharsets.UTF_8.toString());
        return encode.replaceAll("\\+", "%20");
    }

    public static void createZip(String sourcePath,String zipPath){
        FileOutputStream fos = null;
        ZipOutputStream zos = null;
        try{
            fos = new FileOutputStream(zipPath);
            zos = new ZipOutputStream(fos);
            writeZip(new File(sourcePath),"",zos);
        }catch(FileNotFoundException e){
            logger.error("创建zip文件失败"+e);
            e.printStackTrace();
        }finally {
            try{
                if(zos!=null){
                    zos.close();
                }
            }catch (IOException e){
                logger.error("创建zip文件失败"+e);
                e.printStackTrace();
            }
        }
    }

    public static void writeZip(File file, String parentPath, ZipOutputStream zos){
        if(file.exists()){
            if(file.isDirectory()){
                parentPath += file.getName() + File.separator;
                File[] files = file.listFiles();
                if(files.length!=0){
                    for(File f:files){
                        writeZip(f,parentPath,zos);
                    }
                }else{
                    try{
                        zos.putNextEntry(new ZipEntry(parentPath));
                    }catch (IOException e){
                        e.printStackTrace();
                    }
                }
            }else{
                FileInputStream fis = null;
                try{
                    fis = new FileInputStream(file);
                    ZipEntry ze = new ZipEntry(parentPath + file.getName());
                    zos.putNextEntry(ze);
                    byte[] content = new byte[1024];
                    int len;
                    while((len = fis.read(content))!=-1){
                        zos.write(content,0,len);
                        zos.flush();
                    }
                }catch (FileNotFoundException e){
                    logger.error("创建zip文件失败，找不到文件");
                    e.printStackTrace();
                }catch (IOException e){
                    logger.error("创建zip文件失败"+e);
                    e.printStackTrace();
                }finally {
                    try{
                        if(fis!=null){
                            fis.close();
                        }
                    }catch (IOException e){
                        logger.error("创建zip文件失败"+e);
                        e.printStackTrace();
                    }
                }
            }
        }
    }

}
